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Multiple domestication events explain the origin of landraces in Mexico. | LitMetric

Multiple domestication events explain the origin of landraces in Mexico.

Ecol Evol

Genética de la Conservación, Jardín Botánico Instituto de Biología, Universidad Nacional Autónoma de México Ciudad de México Mexico.

Published: March 2023

AI Article Synopsis

Article Abstract

Several Mesoamerican crops constitute wild-to-domesticated complexes generated by multiple initial domestication events, and continuous gene flow among crop populations and between these populations and their wild relatives. It has been suggested that the domestication of cotton () started in the northwest of the Yucatán Peninsula, from where it spread to other regions inside and outside of Mexico. We tested this hypothesis by assembling chloroplast genomes of 23 wild, landraces, and breeding lines (transgene-introgressed and conventional). The phylogenetic analysis showed that the evolutionary history of cotton in Mexico involves multiple events of introgression and genetic divergence. From this, we conclude that Mexican landraces arose from multiple wild populations. Our results also revealed that their structural and functional chloroplast organizations had been preserved. However, genetic diversity decreases as a consequence of domestication, mainly in transgene-introgressed (TI) individuals (π = 0.00020, 0.00001, 0.00016, 0, and 0, of wild, TI-wild, landraces, TI-landraces, and breeding lines, respectively). We identified homologous regions that differentiate wild from domesticated plants and indicate a relationship among the samples. A decrease in genetic diversity associated with transgene introgression in cotton was identified for the first time, and our outcomes are therefore relevant to both biosecurity and agrobiodiversity conservation.

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Source
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC9994486PMC
http://dx.doi.org/10.1002/ece3.9838DOI Listing

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